Pump.



w. KIESERQG. PAGEL.

PUMP.' APPLICATION mmlc. 2o.. 1915.

' Patented Feb. 6,1917.

'Im/e2 rizcSr-s-:n 'Walter- Kieser 'Gustav Pa l UNTTED STATES PATENTorFioE.

WALTER KIESER AND GUSTAV' PAGEL, 0F CHARLOTTENBURG, GERMANY, ASSIGNORSTO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

PUMP.

Specification of Letters Patent.

Application filed October 20, 1915. Serial No. 56,969.

To all whom yz't may concer/n.'

Be it known that we, WALTER 'K1EsER, a

citizen of the Swiss Republic, and GUsTAv gal pumps of the type havingan impeller4 which receives the liquid being pumped at the side anddischarges it at the periphery. With such pumps when the supply ofliquid being pumped is small and below the capacity of the pump more orless, air is sucked in and discharged with the fluid, since the liquiddoes not at such times wholly cover the admission opening or eye of theimpeller. Although this is unobjectionable in various installations, yetin many cases it is highly objectionable, as, for eX; ample, in pumpsused for pumping the water of condensation from condensers, which' wateris used as feed water, as the air therein may cause corrosion of thewalls of the boilers.

The object of the present. invention is to provide an improvedarrangement or structure in a pump of this type'which will prevent atall times air being sucked into the impeller and discharged along withthe liquidbeing pumped. l

For a consideration of what we believe to be novel and our inventionlattention is directed to the accompanying specicationand the claimsappended thereto.

In the' drawing wherein we have illustrated one form which our inventionmay take, Figure 1 is a sectional view through a pump, and Fig. 2 is asection taken at right angles to Fig. l.

Referring to the drawing, 5 indicates the suction chamber of the pumpcasing having the 'admission opening 6, and 7 indicates the dischargescroll which terminates in the discharge pipe 8. 9 indicates the pumpshaft which extends into the casing through a suitable packing 10 andcarries on its end the impeller 11 provided with vanes 12. This impellermay be of any usual or desired structure. It receives the liquid to bepumped at the side and discharges it at the periphery, as is Wellunderstood. The structure so far described is that of an ordinary typeof pump. lVhen such a pump is in operation it will be clear that, whenthe whole admission area of the impeller is not covered with liquid tobe pumped, air will be sucked into the impeller. One way to preventthls, in accordance with our invention, is that illustrated in thedrawing in which a wall 13 is provided in the 'suction chamber of thepump which defines passages 14 and 15, and an admission opening- 16 tothe impeller, which opening is located at the bottom of the impeller.This wall 13 forms in effect a partition in the suction chamber andprojects down so far that air can not'enter the admission opening 16even atthe lowest level of the Water. In other words, it forms a trap orliquid seal for the inlet side of the impeller. Viewed from adilerentaspect. it may be considered that the chamber formed by the partitionmember 13 in front of the eye of the impeller is the suction chamber ofthe pump and that passages 14 and 15 are conduits for directing theliquid through the opening 16 to the impeller.

. In operation the passages 14 and 15 carry the liquid to be pumped downaround the impeller and it enters the space in front of the eye of theimpeller through opening 16.

Here it is taken by the impeller and dis .that it is vmore economical inthe consump' tion of power since the required power will alwayscorrespond to the effective output of the pump for the time being. Thisis due to the fact that the pump is never called upon to pump anythingexcept the liquid intended. i

In accordance with the provisions of the patent statutes, we havedescribed the principle of operation of our invention, together with theapparatus which we' now considerto represent the best embodimentthereof; but we desire to have it understood that the apparatus shown isonly illustrative, and that the invention can be carried out by othermeans.

What we claim as new 'and desire to se- Patented Feb-6, 1917. I

cure by Letters Patent of the UnitedStates, 1s:-

1. In a liquid pump, the suction opening of which is atv times onlypartially supplied With liquid, the combination of a casing, an impellerin the casing, a wall surrounding the eye of the impeller and forming asuction chamber directly in front of it, said .Wall having an opening atits lower portion, and means forming a conduit for supplying fluid tosaid opening, said conduit extending from a point above the opening downto it whereby the fluid will be supplied to it by gravity and a trapformed to prevent the admission of gases to the impeller. i

2. rlhe combination With a centrifugal pump having a suction chamber, ofa partition member in the suction chamber which' surrounds `the eye ofthe impeller and defines an opening at the lowest point thereof for theadmission of the liquid to be pumped to the impeller.

3. The combination of a casing having an inlet, an impeller in thecasing, a discharge scroll surrounding it, and a partition member in thecasing which surrounds the eye of the impeller and has an opening at itslowest point for admitting liquid to the impeller, said partition memberdelining a passage for conveying liquid from the inlet to said opening.'

In Witness whereof, We have hereunto set our hands this 23 day ofSeptember, 1915.

WALTER KIESER. GUSTAV PAGEL.

Witnesses 4 GEORG FORNER, HERM. HILLS.

